或者一个观察术语能否偶尔指可观察物偶尔又指不可观察物呢？

Or can an observation term refer sometimes to an observable thing and sometimes to an unobservable?

youdao

简而言之：如果一个“观察术语”原则上只用于只可观察对象，那么就没有观察术语。

In short: if an "observation term" is a term which can, in principle, only be used to refer to observable things, then there are no observation terms.

youdao

这些文字揭示了卡尔纳普起码认为观察术语是对不同过一起就能发现的特性的错误描述。

These paragraphs reveal that Carnap, at least thinks of observation terms as corresponding to qualities that can be detected without the aid of instruments.

youdao

And, if you look in the very high numbers, you will see these nomenclatures.

如果你观察高序数的元素，你会发现这些术语。

麻省理工公开课 - 固态化学导论课程节选